During the War of the Orb in the First Era, SiIvaGunner won the War because of a mistake caused by Jeff Cuphead. Because of this, Monika Sans swore eternal hatred to him, and began the Monikan War near the dawn of the Second Era. The War was waged over many universes, taking control of many of them. The battle was waged until Jeff Cuphead fell through Dayman's wormhole, and soon after he defeated Monika Sans.